Illuminatus Primus
First of all thanks for the welcome. Like I said this is a very interesting topic and its something that I can get into and contribute.
By the way, the way you describe the astrographic regions of the galaxy make a lot of sense. I think that they are very workable and very useful and interesting. In addition, I find myself very much liking the idea of the Star Wars galaxy being not just one galaxy but the nearby galactic cluster.
By the way, one of the reasons we could explain about why they never visited other galaxies beyond the local cluster (beyond the few out glaxy exploration missions) is that the other galaxies might be beyond a certain range. That the Star Wars Territory is a cluster of nearby galaxies (one main and maybe a dozen or so minor) and that beyond that cluster is a huge swathe of empty universal space - so far that normal galactic navigation does not actually work as well.
But yeah, I like your two points on galactic astrogation and organization. It very much works.
I want to mention something. I don't think I was clear enough when I said no-inside sources. And that is my fault. I didn't mean that we couldn't include such things as part of the general fluff of what we are doing, its just that WE (as the project members) need to have a totally and completely unbised sense of what occured in the galaxy. A writers bible as you mentioned. So yeah, while something can be written from the point of view of an in-game character, we need to know what is actually technically true and what is not. I hope that makes it clear.
This pretty much comes from the fact that I very much dislike how the Imperial Sourcebook (which is a book i love) was written from the point of view of a rebel historian.
On Thawn.
I like this - "He should and will be a Ramanujan of military science, a freak savant of tactics and strategy with almost no peers within his magisterium." and this "However, the fact is that he loved and admired the Emperor, he was a committed authoritarian and autocrat, he was deceitful and eager for power." and this "I do like that he is a connoisseur of art and considers his profession not just a science, but also an art itself - it brings great parallels with Palpatine, who maintains the same conceits. I do like that he likes to muse about the psychology of his opponents based on art taste, which is lots of narrative and thematic fun." and this "like the idea he uses a lot of psychological slieghts-of-hand and shadows on his own subordinates, to keep them in awe and suspended terror of his talents and seeming omniscience."
I kinda disagree with this - "I mean the implication that he knows what Ackbar will do based purely on guesswork after admiring the being's art is ridiculous." and this "But it shouldn't be acknowledged as the actual source of his genius." I disagree with those because, at least in my opinion, it was a major part of who the character was.
I guess what I am saying is that I do not dislike him being nasty, brutish, imperialistic. Nor do I have a problem with him having five thousand secret intelligence soruces that aid him. Nor do I think he should just use one method to the exlusion of all others. But the thing about his art fetish, well, that is pretty much one of the core character concepts of him. Now, this doesn't mean that we need to state conclusively that it is how he does things, but I also don't think we should state that this is not how he does things. If you know what I mean. Yeah, multiple conflicting stories being given to various people through the itme of his reign could be interesting and cool. It could provide readers with more information and more wonder on what is the truth.
But to me the truth is pure mental capability, training, advanced Intellignece gathering, psychological training, and then maybe art.
While I know we cannot ignore this, I so wish we could drop the idea of Byss and Palpatine. Not because I dislike the Byss storyline (though some aspects of it does need some work) but because what it means for Thrawn. hehe
Honestly, despite what I might be saying, I don't have a problem with Thrawn failing (well, no more of a problem in our project compared to what I had when I read it in the first place, but that is besides the point). So yeah, we will have to do exactly what we have to do.
And this is not a point trying to change the topic because Thrawn is an awesome character and worthy of our work, but I think that maybe we should start with the Battle of Endor and the aftermath of Palpatine's demise.
I do agree with you that the Imperial Remnant is not the same as the Galactic Empire in terms of true polticial thought. At the same time I never thought that they referred to themselves as the Remnent. They were always the Empire or Imperials. So, maybe the dropped the Galactic part but they never termed themselves the Remnent. Despite them not being true Galactic Empire. I hope my clarification makes sense.
About the Dark Horse Comics area, that's fine. I'm not a very solid fan of that part so I don't actually mind. And while certain aspects of the Yuuzhan Vong War were interesting, a lot of it wasn't. So I also have no problem with that. I also despied the Swarm War and the second separatist movement that happened afterward, so I have no problem with us ignoring that part. Or at least working on it later.
So yeah, I get what your saying about not worrying about that part of the timeline right now and not being constrained by it. That is completely fine.
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On some points made above by others
1) I so totally and completely approve of the idea of some Rebels having TIEs and some Imperials having X-Wings. I also approve of the idea that while new ships are used, that some Imperials (and Rebels) will use the old ships of the Galacitc Republic - including all those fighter types.
Personally, I am in love with the concept of an Imperial Battlegroup using only wedge- and triangular-shaped fighters and starships. I think it would look cool.
2) I also agree with the concept of the removal of institutionalized misogyny. I do not thing it should be major, important or any other feature of note. This is the Star Wars Galaxy, a galaxy with over 25,000 years of recorded history and social development, to me galactic misogyny should be not a major concept.
I also beleive that within the field of general anti-alien feelings. To me the Empire should have no problem with alien employees if they are good, though they might be segregated into different naval units, army detachments or government services. But that is just me.
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People post faster than I realize.

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Illuminatus Primus,
While I do not disagree with you on your point sof organization, I do disagree with you points about the relationship between Pellaeon and Thrawn. Pellaeon is a protege to Thrawn, he is also his second and whatnot. I think that is made multiple times both in the Thrawn trilogy and afterward, whenever Pellaeon is musing about the past.
I really do disagree with you on this issue. Pellaeon was chosen by Thrawn personally to be the one he made contact with. That's gotta mean something in the chain of command.
Honestly, I really think that this is an issue that we should put off until we come up with a timeline and information on the five or whatever years that precedes it from the Battle of Endor.
Darth Hoth
Your point about the Chis being in a small nearby dwarf galaxy is really cool. That way when they speak of 'galactic' threats, they can be totally honest - galactic threats related to their small galaxy, not to the other galaxies in the nearby cluster.
I also have no problem with ignoring the Yuuzhan Vong and what they do. Though, at the same time, I do thing that we need to have some sort of major Galactic War or something, that way our timeline matches up with the real one. But that is a while for now.
Your points about the past are well founded and something that I think bears mentioning. I very much support the fact of the view that the Galactic Empire is the Galactic Republic with some name and basic organizational changes. That it is in many ways a continuance of previous governing bodies.
This is a difference between the Galactic Empire and the New Republic for the New Republic is a break from the past. An entire new government institution.
I also want to mention that I totally approve of an idea that the past is known to the galaxy at large. That one can go to a Library and read about the Founding of the Galactic Republic. That wouldnt be that bad because right next to it in shiny new colors would be a book about the fall and the chaos and how the Empire is the best government of all. True history next door to propaganda.
I also agree with you on the New Republic and how its a weak in many ways and that so many problems would have to exist.
Like the galaxy has sectors and oversectors (heck, I think it should have subsectors and the subsector be the fifty world thing, with sectors being made up of multiple subsectors, but that is just me). The idea of minor regions, major regions and galactic regions all make a lot of sense. Its multiple people over many millenia using the same term to describe different concepts.
Of course one could also use other terms to describe the same thing.
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I personally think that we should start with right after the Battle of Endor and begin their. Its a perfect place to start in my estimation.